[Polly] Remove autotools build systems from Externals. NFC.Building a source distribution using autotools adds GPL-licencedfiles into the the sources. Although redistribution of theses files isex
[Polly] Remove autotools build systems from Externals. NFC.Building a source distribution using autotools adds GPL-licencedfiles into the the sources. Although redistribution of theses files isexplicitly allowed with an exception, these are not used by Pollywhich uses a CMake replacement. Use the direct source checkoutinstead (replacing the output of 'make dist').Some m4 scripts with the same licence are also included in isl/ppcgrepository. Removing them renders the autotools-based build sciptsinoperable, so remove the autotools build system altogether.
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